Sidewalk-trap.



T. M. BRINTNALL. SIDE-WALK TRAP. APPLICATION FILED AUG.2B,1911.

Patented Apr. 23, 1912.

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UNITED STATES PATENT OFFlCE.

THOMAS M. BRINTNALL, OF OAKLAND, CALIFORNIA, ASSIGNOR OF ONE-HALF W. D.HAMMOND, 0F LOS ANGELES, CALIFORNIA.

SIDEWALK-TRAP.

Application filed August 28,

To all whom it may concern:

Be it known that I, THOMAS M. BRINT- NAIL, a citizen of the l nitedStates. residing at Oakland, in the county of Alameda and State ofCalifornia, have invented a new and useful Sidewalk-Trap, of which thefollowing is a specification.

This invention relates to sidewalk traps. and particularly to one inwhich the body portions of the doors are formed of concrete or otherpavement material. which preferably corresponds to the material of whichthe sidewalk constructed. and the hinges are concealed. the entire uppersurface of the trap is flush with the sidewalk and there are nodepressions, obstructions. or open seams or cracks, the entire, uppersurface presented being smooth, uninterrupted and of a uniform height,thus providing no impediment to traffic.

Referring to the drawings: Figure 1 is a plan view. Fig. 2 is a sectionon line a m Fig. 1. on an enlarged scale. Fig. 3 is a ection on line ma? Fig. 2. Fig. l is a view of the structure adjacent a hinge. similarto the View shown in Fig. 2, and illustrates a modification.

1 designates the sidewalk in which the trap is placed, the opening inthe sidewalk being lined with a channel iron .2. At each end is aframe-bar 3 and secured to the lower flange 0f the frame-bar 3 is oneleaf 4 of a hinge 5, the other leaf 6 of the hinge 5 being secured to ametal plate 7. which forms part of the trap and is provided with anupturned flange 8 at one end. A T-har 9 extends around the four edges ofthat sec tion of the trap and is secured to the plate 7 and flange 8 andforms a frame in which is supported a panel of concrete or othersuitable material 10, which is reinforced by a Wire net work 11. Theinner bar of the frame 9 has an angle iron 12 secured thereto with awedge-shaped piece 13 in the corner of the angle iron. The opposite trapis similarly constructed except that it has no angle iron 12, but has awedgeshaped piece 14 secured directly to the frame 9, the taper of thewedge piece 14 being parallel to that of the piece 18, so that a tightfitting joint is secured when the trap is closed.

Secured to the plate 7 is a. bracket 1:} having an arm 16 from which issuspended Specification of Letters Patent.

Patented Apr. 23, 1912.

1911. Serial No. 646,542.

a weight 17, and as clearly shown in Fig. 3, a pivoted hook 18 serves toengage the arm 16 when the trap is closed, the hook being weighted at15) so that it will engage the arm 1t. and hold the latter in horizontalposition when the trap is closed, preventing the trap from being raisedfrom the (rllf l(l until after the hook has been disengaged.

In order to fill the space in the upper portion of the frame-bar 3 ofthe flange S, I provide concrete strips .20 which are embedded in themetal tray 21 which fits within this space and makes a perfectclosureand a uniform and unobstructed surface at the top of the trap.Each of the strips 20 is provided with suitable lifting devices 22 asare also the hinged panels 10.

Then the hooks 18 are released. the two members of the trap may easilybe swung up by means of the lifting devices 22. after the strips 20 havebeen removed, the counter-weights 17 substantially counterbalancing theweight of the hinged trap members. so that no great effort required toswing them up or close them. When the hinged trap members are to beopened. the filler strips 20 are laid at one side to be rcplaced afterthe trap is closed.

In the form shown in Fig. 4, the construction is similar to theforegoing. except in the place of the filler strips 90, I provide ametal plate which rests on a rib 34 formed on the framebar 3 and a rib25 formed on the flange 8. The frame-bar 3 also has a central depression24 which acts as a drain.

What I claim is:

1. A sidewalk trap, comprising two hinged members formed of cementpanels, a metal frame surrounding each panel, a metal frame surroundingboth panels, a hinge support at the outer edge of the metal frame oneach panel and removable closures between the hinged edge of each paneland the outer frame.

2. A sidewalk trap, comprising two hinged members formed of cementpanels, a metal frame surrounding each panel, a metal frame surroundingboth panels, a hinge support at the outer edge of the metal frame oneach panel and removable closures between the hinged edge of each paneland the outer frame, the metal frame around each panel being formed as aTbar, a reinforcing means supported by the flange of the T-bar andembedded in the cement.

3. A sidewalk trap,comprising twohinged members formed of cement panels,a metal frame surrounding each panel, a metal frame surmunding bothpanels, a hinge support at the outer edge of the metal frame on ,H'llpanel and removable closures between the hinged edge of each panel andthe outer frame, the outer edge of one of said panel frames having aflange and a Wedgeshaped piece on the flange, the frame member of theother panel ha ring a Wedge-shaped piet'e on its edge, adapted to restagainst the first named Wedge-shaped piece to form a tight joint whenthe trap is closed.

4. A sidewalk trap, comprising two hinged members formed of cementpanels, a metal frame surrounding each panel, a metal frame surroundingboth panels, a hinge support at the outer edge of the metal frame oneach panel and removable closures between the hinged edge of each paneland the outer frame, the metal frame around each panel being formed as aT-bar, a remforcmg means supported by the flange of the T-bar andembedded in the cement, a plate supporting the outer edge of each paneland having a vertical flange, said hinge means being secured to saidplate, a bracket secured to said plate, an arm carried by said bracket:extending OYQF the hinge means in a direetimi opposite to the panel anda weight carried by said arm.

.3. A sidewalk trap, comprising two eement eonirete panels, a metalframe around the opening in the sidewalk, a frame-bar along the outeredge of eaeh panel. hinge means between each framebar and the associatedpanel and below the upper surface of the panel, and reintwaliile tillermeans at the hinged edge of each panel and flush with the upper surfaceof the panels.

In testimony whereof. I have hereunto set my hand at Los AngelesCalifornia this 22 day of August, 1911.

THOMAS M. BHINTNALL.

In presence of (l. l. HACKLEY, timers RUssnLL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. G.

